I've got a PPro 1500w 254mm portable table saw (model CLM1500TSS) which I was moderately happy with, until I discovered the reason why it wasn't cutting as accurately as I wanted. Dropping a combination square on the T-track and butting the end up to the part of the saw blade closest to me revealed a noticeable gap occurring as I pushed the square up the track. As I see it, the arbor is out of plumb to the table, but despite turning it upside down and looking into the guts of the thing, I really can't see any obvious to adjust.
The performancepowertools.com website appears to be defunct and a phone call to the help line proved no help at all.
If anyone else is interested, I discovered that slackening off the four bolts holding the blades rise/fall/tilt mechanism (two with Allen head bolts and two a bit deeper down with cross-head bolts I think) allows for enough movement to get the blade back in line again.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix circular saws.